Several general time simulation settings must now be set:
Under Simulation Data > Simulation Settings, select the Quality tab:
Change the Type to Chemical, enter Chlorine as Chemical Name, and set the units to mg/l.
On the Reactions tab, retain the default reaction orders of 1.
This will allow an analysis of the decay of chlorine in the pipe network. Select OK.
Under Simulation Data > Simulation Tables > Water Quality of Sources, enter the following:
Set the Source Type to CONCEN for Node 1 (WTP) (double-click on the Node Code field), with 2 (mg/l), following injection Pattern 2.
Under Simulation Data > Simulation Tables > Time Patterns, enter in the Time Simulation Pattern Data table the following:
Add the second pattern, with Descr of Chlorine. Set the Total Number of Factors to 24. Then, double click on the Factor field, and define 1.0 for the first 24 hours. Double-click on the Multiplier field, and confirm that 1.0 is filled everywhere (this will simulate a constant concentration of 2.0 mg/l chlorine at the WTP, over 168 hours). Close the editor.
The above step is actually not required to be performed, and is only used to illustrate the use of patterns. Reservoirs (fixed sources of water) are assumed to have a constant concentration. Only an initial quality setting is required to define the constant concentration.
Under Simulation Data > Simulation Data in Model Tables > Reaction Coefficients (Pipe), enter in the Pipe/CV Table the following:
Set Tsim Bulk Rx Coefficient to -0.5 for all pipes.
Set Tsim Wall Rx Coefficient to -1.0 for all pipes.
These values define the rate of reaction of chlorine in the water and against the wall. Close the pipe table.
Under Simulation Data > Simulation Data in Model Tables > Initial WQ (Tank/Source), enter in the Tank Table the following:
Set Tsim Initial Quality for Tank 1 to 2.0 mg/l.
Set Tsim Initial Quality for Tank 8 to 1.2 mg/l.
These define the initial chlorine content in the tanks. Close the table.
Under Simulation Data > Simulation Data in Model Tables > Initial WQ (Node), enter in the Node Table the following:
Set Tsim Initial Quality to 0 mg/l for all nodes.
Now store the System Data (which includes all Time Simulation Data) using Manage Models > Save Model As... to Documents\GLS\Wadiso\Wadiso 6 - My Future WQ.wlz (Correct file stored as Documents\GLS\Wadiso\Wadiso 6 - Tutorial Future WQ_backup.wlz, if user wants to import).
Run the time simulation via Analysis > Time Simulation > Run Simulation.
Then, right-click on the nodes and tanks listed here below, followed by clicking on Selected Nodes(1), then on T/S Graph Selected Node/Tank, and then on the Quality tab.
Notice the following:
Tank 1 (WTP) shows a constant concentration of 2 mg/l. This is a boundary condition.
Node 1000 (Large user) shows the concentration of chlorine at the large user. It eventually stabilizes around 0.19 mg/l.
Tank 8 (Balancing, east) starts with the initial concentration of 1.2 mg/l, but drops near linearly over time to 0.45 mg/l as water mixes in the tank.
